6mm Bore Bearing - 21mm Round Nylon Pulley U-Groove Track Roller 6x21x7mm Outer Diameter - 7mm Type: Deep Groove Miniature Ball

Type: Deep Groove Miniature Ball Bearings

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6mm Bore Bearing - 21mm Round Nylon Pulley U-Groove Track Roller 6x21x7mm Outer Diameter - 7mm Type: Deep Groove Miniature Ball6mm Bore Nylon U Groove Pulley with Built in Track Roller Bearing 6x21x7mm This is a single U groove nylon pulley with a 6mm inner diameter and a built in steel ball bearing. Commonly used in sliding doors, 3D printers, track systems, and automation setups where smooth guided motion is key. Size: 6mm x 21mm x 7mm Inner diameter (bore): 6mm Outer diameter: 21mm Tire width: 7mm Pulley material: White nylon Integrated steel ball bearing Style: U groove